$A$ patient suffering from cholera is given a saline drip because:

Choose the correct sentences.
$(1)$ Electrolytes like $Na^+, K^+, Cl^-, HCO_3^-$ are present in saliva.
$(2)$ Starch is converted into maltose by the help of salivary amylase at $pH \, 6.8$.
$(3)$ The intrinsic factor of the stomach is essential for the absorption of vitamin $B_{12}$.
$(4)$ Di- and monoglycerides are broken down into fatty acids and glycerol by lipases.

Study the following diagram showing $(P-S)$ labelling and choose the correct option that shows two correct matches.

$A$ healthy person eats the following diet: $5 \, gm$ raw sugar,$4 \, gm$ albumin,$10 \, gm$ pure buffalo ghee adulterated with $2 \, gm$ vegetable ghee (hydrogenated vegetable oil),and $5 \, gm$ lignin. How many calories is he likely to get?

Match the following columns:

Column-$I$	Column-$II$
$a.$ Lysozyme	$(i)$ $HCl$
$b.$ Peptic cells	$(ii)$ Antibacterial enzyme
$c.$ Saliva	$(iii)$ Sublingual gland
$d.$ Oxyntic cells	$(iv)$ Pepsinogen

Animals that eat their own faecal matter are known as: